A nurse is caring for a client who has left lower-lobe atelectasis. In which of the following positions should the nurse place the client for postural drainage?

The correct answer is B: Right lateral in Trendelenburg position. Placing the client in a right lateral position helps target the left lower-lobe atelectasis by allowing drainage of secretions from that specific area. Trendelenburg position further aids in promoting drainage due to the head being lower than the feet, assisting gravity in moving secretions. Other options are incorrect as they do not provide the specific positioning needed to target the left lower-lobe atelectasis effectively. Side-lying with the right side of the chest elevated would not facilitate drainage from the affected lobe. Placing the client prone with pillows under the lower extremities or supine in low-Fowler's position would not target the specific area requiring drainage.